ISSN 1009-6248CN 61-1149/P 双月刊

主管单位:中国地质调查局

主办单位:中国地质调查局西安地质调查中心
中国地质学会

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    东秦岭二郎坪群马道铅锌银矿床地质特征及找矿模式

    Geological Characteristics and Prospecting Model of Madao Lead-Zinc-Silver Deposit in Erlangping Group, East Qinling Mountains

    • 摘要: 马道铅锌银矿床位于泌阳县城东南约18 km的大别山北麓,处于东秦岭造山带之北秦岭褶皱带北翼刘山岩组中,矿体分为层状与网脉状。层状矿体顺层分布于以基性火山岩为底板的火山碎屑、热水沉积蚀变岩中,属溢流相;网脉状矿体分布于蚀变岩筒中,属火山颈相。两者在空间上形成“T”字型,空间上构成完整火山机构模型,属VMS矿床。勘查工作采用土壤地球化学测量及物探电法测量效果较好,矿区表生土壤Au、Ag、Pb、Zn呈强富集分布,深部矿体呈中高电阻率、高极化率分布的特征。通过总结矿床地物化特征,笔者建立了该类矿床的找矿模式,对区域上寻找类似矿床提供参考。

       

      Abstract: The Madao lead-zinc-silver deposit is located in the northern foot of the Dabie Mountains, about 18 km southeast of the Biyang County. It is located in the Liushan rock formation on the north wing of the north Qinling fold belt of the East Qinling orogenic belt. The ore body is divided into layered and reticular. The layered ore body is distributed in the volcanic debris and hydrothermal sedimentary altered rock with the basic volcanic rock as the floor, which belongs to the overflow phase. The stockwork ore body is distributed in the altered rock tube, which belongs to the volcanic neck facies. Both of them form a 'T' shape in space and form a complete volcanic mechanism model in space, which belongs to the VMS deposit. The exploration work adopts soil geochemical survey and geophysical electrical method to measure the effect is good, the surface soil Au, Ag, Pb and Zn in the mining area are strongly enriched and distributed, and the deep ore body is characterized by medium and high resistivity and high polarizability distribution. This paper summarizes the geophysical and geochemical characteristics of the deposit, establishes a prospecting model, and provides a reference for the search for similar deposits in the region.

       

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